not a bomb. It's a powder form of purified uranium ,after being mined & extracted but before being refined further into fuel or enriched

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Follow up question, what is uranium and what is it used for?

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Uranium. Element 92.

Since it is quite radioactive it is primarily used for nuclear fuel or nuclear weapons. Uranium isotopes with less radioctivity is used for bullets & armor. Formerly used in the glass industry to make green/yellow tinted glass

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> It's a powder form of purified uranium

It is not purified uranium. It is uranium oxide. Before being reduced to the metal.

https://en.wikipedia.org/wiki/Yellowcake

>Yellowcake (also called urania) is a type of uranium concentrate powder obtained from leach solutions, in an intermediate step in the processing of uranium ores. It is a step in the processing of uranium after it has been mined but before fuel fabrication or uranium enrichment.

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